chore: import upstream snapshot with attribution

docs-website/reference_versioned_docs/version-2.27/integrations-api/faiss.md

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+---
+title: "FAISS"
+id: integrations-faiss
+description: "FAISS integration for Haystack"
+slug: "/integrations-faiss"
+---
+
+
+## haystack_integrations.components.retrievers.faiss.embedding_retriever
+
+### FAISSEmbeddingRetriever
+
+Retrieves documents from the `FAISSDocumentStore`, based on their dense embeddings.
+
+Example usage:
+
+```python
+from haystack import Document, Pipeline
+from haystack.components.embedders import SentenceTransformersTextEmbedder, SentenceTransformersDocumentEmbedder
+from haystack.document_stores.types import DuplicatePolicy
+
+from haystack_integrations.document_stores.faiss import FAISSDocumentStore
+from haystack_integrations.components.retrievers.faiss import FAISSEmbeddingRetriever
+
+document_store = FAISSDocumentStore(embedding_dim=768)
+
+documents = [
+    Document(content="There are over 7,000 languages spoken around the world today."),
+    Document(content="Elephants have been observed to behave in a way that indicates a high level of intelligence."),
+    Document(content="In certain places, you can witness the phenomenon of bioluminescent waves."),
+]
+
+document_embedder = SentenceTransformersDocumentEmbedder()
+document_embedder.warm_up()
+documents_with_embeddings = document_embedder.run(documents)["documents"]
+
+document_store.write_documents(documents_with_embeddings, policy=DuplicatePolicy.OVERWRITE)
+
+query_pipeline = Pipeline()
+query_pipeline.add_component("text_embedder", SentenceTransformersTextEmbedder())
+query_pipeline.add_component("retriever", FAISSEmbeddingRetriever(document_store=document_store))
+query_pipeline.connect("text_embedder.embedding", "retriever.query_embedding")
+
+query = "How many languages are there?"
+res = query_pipeline.run({"text_embedder": {"text": query}})
+
+assert res["retriever"]["documents"][0].content == "There are over 7,000 languages spoken around the world today."
+```
+
+#### __init__
+
+```python
+__init__(
+    *,
+    document_store: FAISSDocumentStore,
+    filters: dict[str, Any] | None = None,
+    top_k: int = 10,
+    filter_policy: str | FilterPolicy = FilterPolicy.REPLACE
+) -> None
+```
+
+Initialize FAISSEmbeddingRetriever.
+
+**Parameters:**
+
+- **document_store** (<code>FAISSDocumentStore</code>) – An instance of `FAISSDocumentStore`.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Filters applied to the retrieved Documents at initialisation time. At runtime, these are merged
+  with any runtime filters according to the `filter_policy`.
+- **top_k** (<code>int</code>) – Maximum number of Documents to return.
+- **filter_policy** (<code>str | FilterPolicy</code>) – Policy to determine how init-time and runtime filters are combined.
+  See `FilterPolicy` for details. Defaults to `FilterPolicy.REPLACE`.
+
+**Raises:**
+
+- <code>ValueError</code> – If `document_store` is not an instance of `FAISSDocumentStore`.
+
+#### to_dict
+
+```python
+to_dict() -> dict[str, Any]
+```
+
+Serializes the component to a dictionary.
+
+**Returns:**
+
+- <code>dict\[str, Any\]</code> – Dictionary with serialized data.
+
+#### from_dict
+
+```python
+from_dict(data: dict[str, Any]) -> FAISSEmbeddingRetriever
+```
+
+Deserializes the component from a dictionary.
+
+**Parameters:**
+
+- **data** (<code>dict\[str, Any\]</code>) – Dictionary to deserialize from.
+
+**Returns:**
+
+- <code>FAISSEmbeddingRetriever</code> – Deserialized component.
+
+#### run
+
+```python
+run(
+    query_embedding: list[float],
+    filters: dict[str, Any] | None = None,
+    top_k: int | None = None,
+) -> dict[str, list[Document]]
+```
+
+Retrieve documents from the `FAISSDocumentStore`, based on their embeddings.
+
+**Parameters:**
+
+- **query_embedding** (<code>list\[float\]</code>) – Embedding of the query.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Filters applied to the retrieved Documents. The way runtime filters are applied depends on
+  the `filter_policy` chosen at retriever initialization. See init method docstring for more
+  details.
+- **top_k** (<code>int | None</code>) – Maximum number of Documents to return. Overrides the value set at initialization.
+
+**Returns:**
+
+- <code>dict\[str, list\[Document\]\]</code> – A dictionary with the following keys:
+- `documents`: List of `Document`s that are similar to `query_embedding`.
+
+#### run_async
+
+```python
+run_async(
+    query_embedding: list[float],
+    filters: dict[str, Any] | None = None,
+    top_k: int | None = None,
+) -> dict[str, list[Document]]
+```
+
+Asynchronously retrieve documents from the `FAISSDocumentStore`, based on their embeddings.
+
+Since FAISS search is CPU-bound and fully in-memory, this delegates directly to the synchronous
+`run()` method. No I/O or network calls are involved.
+
+**Parameters:**
+
+- **query_embedding** (<code>list\[float\]</code>) – Embedding of the query.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Filters applied to the retrieved Documents. The way runtime filters are applied depends on
+  the `filter_policy` chosen at retriever initialization. See init method docstring for more
+  details.
+- **top_k** (<code>int | None</code>) – Maximum number of Documents to return. Overrides the value set at initialization.
+
+**Returns:**
+
+- <code>dict\[str, list\[Document\]\]</code> – A dictionary with the following keys:
+- `documents`: List of `Document`s that are similar to `query_embedding`.
+
+## haystack_integrations.document_stores.faiss.document_store
+
+### FAISSDocumentStore
+
+A Document Store using FAISS for vector search and a simple JSON file for metadata storage.
+
+This Document Store is suitable for small to medium-sized datasets where simplicity is preferred over scalability.
+It supports basic persistence by saving the FAISS index to a `.faiss` file and documents to a `.json` file.
+
+#### __init__
+
+```python
+__init__(
+    index_path: str | None = None,
+    index_string: str = "Flat",
+    embedding_dim: int = 768,
+) -> None
+```
+
+Initializes the FAISSDocumentStore.
+
+**Parameters:**
+
+- **index_path** (<code>str | None</code>) – Path to save/load the index and documents. If None, the store is in-memory only.
+- **index_string** (<code>str</code>) – The FAISS index factory string. Default is "Flat".
+- **embedding_dim** (<code>int</code>) – The dimension of the embeddings. Default is 768.
+
+**Raises:**
+
+- <code>DocumentStoreError</code> – If the FAISS index cannot be initialized.
+- <code>ValueError</code> – If `index_path` points to a missing `.faiss` file when loading persisted data.
+
+#### count_documents
+
+```python
+count_documents() -> int
+```
+
+Returns the number of documents in the store.
+
+#### filter_documents
+
+```python
+filter_documents(filters: dict[str, Any] | None = None) -> list[Document]
+```
+
+Returns documents that match the provided filters.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\] | None</code>) – A dictionary of filters to apply.
+
+**Returns:**
+
+- <code>list\[Document\]</code> – A list of matching Documents.
+
+**Raises:**
+
+- <code>FilterError</code> – If the filter structure is invalid.
+
+#### write_documents
+
+```python
+write_documents(
+    documents: list[Document], policy: DuplicatePolicy = DuplicatePolicy.FAIL
+) -> int
+```
+
+Writes documents to the store.
+
+**Parameters:**
+
+- **documents** (<code>list\[Document\]</code>) – The list of documents to write.
+- **policy** (<code>DuplicatePolicy</code>) – The policy to handle duplicate documents.
+
+**Returns:**
+
+- <code>int</code> – The number of documents written.
+
+**Raises:**
+
+- <code>ValueError</code> – If `documents` is not an iterable of `Document` objects.
+- <code>DuplicateDocumentError</code> – If a duplicate document is found and `policy` is `DuplicatePolicy.FAIL`.
+- <code>DocumentStoreError</code> – If the FAISS index is unexpectedly unavailable when adding embeddings.
+
+#### delete_documents
+
+```python
+delete_documents(document_ids: list[str]) -> None
+```
+
+Deletes documents from the store.
+
+**Raises:**
+
+- <code>DocumentStoreError</code> – If the FAISS index is unexpectedly unavailable when removing embeddings.
+
+#### delete_all_documents
+
+```python
+delete_all_documents() -> None
+```
+
+Deletes all documents from the store.
+
+#### search
+
+```python
+search(
+    query_embedding: list[float],
+    top_k: int = 10,
+    filters: dict[str, Any] | None = None,
+) -> list[Document]
+```
+
+Performs a vector search.
+
+**Parameters:**
+
+- **query_embedding** (<code>list\[float\]</code>) – The query embedding.
+- **top_k** (<code>int</code>) – The number of results to return.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Filters to apply.
+
+**Returns:**
+
+- <code>list\[Document\]</code> – A list of matching Documents.
+
+**Raises:**
+
+- <code>FilterError</code> – If the filter structure is invalid.
+
+#### delete_by_filter
+
+```python
+delete_by_filter(filters: dict[str, Any]) -> int
+```
+
+Deletes documents that match the provided filters from the store.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – A dictionary of filters to apply to find documents to delete.
+
+**Returns:**
+
+- <code>int</code> – The number of documents deleted.
+
+**Raises:**
+
+- <code>FilterError</code> – If the filter structure is invalid.
+- <code>DocumentStoreError</code> – If the FAISS index is unexpectedly unavailable when removing embeddings.
+
+#### count_documents_by_filter
+
+```python
+count_documents_by_filter(filters: dict[str, Any]) -> int
+```
+
+Returns the number of documents that match the provided filters.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – A dictionary of filters to apply.
+
+**Returns:**
+
+- <code>int</code> – The number of matching documents.
+
+**Raises:**
+
+- <code>FilterError</code> – If the filter structure is invalid.
+
+#### update_by_filter
+
+```python
+update_by_filter(filters: dict[str, Any], meta: dict[str, Any]) -> int
+```
+
+Updates documents that match the provided filters with the new metadata.
+
+Note: Updates are performed in-memory only. To persist these changes,
+you must explicitly call `save()` after updating.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – A dictionary of filters to apply to find documents to update.
+- **meta** (<code>dict\[str, Any\]</code>) – A dictionary of metadata key-value pairs to update in the matching documents.
+
+**Returns:**
+
+- <code>int</code> – The number of documents updated.
+
+**Raises:**
+
+- <code>FilterError</code> – If the filter structure is invalid.
+
+#### get_metadata_fields_info
+
+```python
+get_metadata_fields_info() -> dict[str, dict[str, Any]]
+```
+
+Infers and returns the types of all metadata fields from the stored documents.
+
+**Returns:**
+
+- <code>dict\[str, dict\[str, Any\]\]</code> – A dictionary mapping field names to dictionaries with a "type" key
+  (e.g. `{"field": {"type": "long"}}`).
+
+#### get_metadata_field_min_max
+
+```python
+get_metadata_field_min_max(field_name: str) -> dict[str, Any]
+```
+
+Returns the minimum and maximum values for a specific metadata field.
+
+**Parameters:**
+
+- **field_name** (<code>str</code>) – The name of the metadata field.
+
+**Returns:**
+
+- <code>dict\[str, Any\]</code> – A dictionary with keys "min" and "max" containing the respective min and max values.
+
+#### get_metadata_field_unique_values
+
+```python
+get_metadata_field_unique_values(field_name: str) -> list[Any]
+```
+
+Returns all unique values for a specific metadata field.
+
+**Parameters:**
+
+- **field_name** (<code>str</code>) – The name of the metadata field.
+
+**Returns:**
+
+- <code>list\[Any\]</code> – A list of unique values for the specified field.
+
+#### count_unique_metadata_by_filter
+
+```python
+count_unique_metadata_by_filter(
+    filters: dict[str, Any], metadata_fields: list[str]
+) -> dict[str, int]
+```
+
+Returns a count of unique values for multiple metadata fields, optionally scoped by a filter.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – A dictionary of filters to apply.
+- **metadata_fields** (<code>list\[str\]</code>) – A list of metadata field names to count unique values for.
+
+**Returns:**
+
+- <code>dict\[str, int\]</code> – A dictionary mapping each field name to the count of its unique values.
+
+#### to_dict
+
+```python
+to_dict() -> dict[str, Any]
+```
+
+Serializes the store to a dictionary.
+
+#### from_dict
+
+```python
+from_dict(data: dict[str, Any]) -> FAISSDocumentStore
+```
+
+Deserializes the store from a dictionary.
+
+#### save
+
+```python
+save(index_path: str | Path) -> None
+```
+
+Saves the index and documents to disk.
+
+**Raises:**
+
+- <code>DocumentStoreError</code> – If the FAISS index is unexpectedly unavailable.
+
+#### load
+
+```python
+load(index_path: str | Path) -> None
+```
+
+Loads the index and documents from disk.
+
+**Raises:**
+
+- <code>ValueError</code> – If the `.faiss` file does not exist.